I see at least 4 verts that don’t seem like they’re connected to anything other than the straight line they’re on, 3 of which are on that edge with the shading issues. are you trying for extra low poly model? if not, ideally, you wouldn’t want more than 5 edges connecting to a single vert becaue the more you have there, the more pinching and artifacts get introduced. (or is this already triangulated?)
